No, I would not average the fan controller temperatures, they return the temperature of the electronics... if using PWM, the will not be excessively hot, but they will be higher than ambient.
If you need more than 3 values averaged, this can be done with the aquasuite > Playground > Virtual Software sensors.
Why not just use the air sensor giving a reasonable value?
Placement of the Ambient Temperature Sensor is important, as radiators radiate. I hang a 90cm '
Stop Sensor' out the back, about a 30cm above the floor. On my current system the ambient sensor was initially located at the front of the radiator, but I found the reported ambient rising as the system load grew.
Hera is a picture of the old location showing the relationship to the radiator, The new sensor cable can be seen going down at the right side below the analog flow meter. (
mora.JPG)